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A sliding camera in an orthogonal polygon P—that is, a polygon all of whose edges are axis-parallel—is a point guard g that travels back and forth along an axis-parallel line segment s inside P. A point p in P is guarded by g if and only if there exists a point q on s such that line segment pq is normal to s and contained in P. In the minimum sliding cameras (MSC) problem, the objective is to guard...
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